IPv6 in Space
work done with the CLEO router in orbit.

The CLEO Cisco router in Low Earth Orbit was the first to test the latest version of the Internet Protocol, IPv6, in space:

This is related to our work on the Interplanetary Internet.

Five years later, Cisco's later IRIS router on the Intelsat-14 communications satellite in geostationary orbit is now IPv6-capable:

Lloyd Wood